Introduction - IBM 2193 Hardware Maintenance Manual

Introduction

This chapter contains the check procedures used to diagnose
the causes of product failures. The diagnostic information
consists of:
Start: This is the starting point for any diagnostic action.
Based on high-level symptoms, the check procedure directs
you to more detailed procedures to help resolve machine
failures.
Index of Symptoms, Messages, Error Codes, or Beeps:
The tables for BIOS Error Messages, Codes, Beeps, and
Error Symptoms list symptoms along with their probable
causes, and direct you to the applicable check procedures to
help resolve machine failures. These tables also list the field
replaceable units (FRUs) most likely to cause a particular
problem.
Check Procedures: When the Start check procedure or the
Index of Symptoms, Messages, Error Codes, or Beeps tables
point you to a specific check procedure, proceed to that
section. If there are any notes or instructions at the top of the
page, read them before you begin with the procedure.
Carefully read each step of the check procedure and perform
the steps as instructed. If you do not remember the location of
a specific part or test point, or an adjustment or removal
procedure, see the chapter that contains that information.
Always return to the check procedure after you do this. In
some cases, you are referred to other check procedures to
detect the cause of the failure.
54